Chimney cap or ventilator



(No Model;) I M. W. KIDDER.

CHIMNEY GAP OR'VENTILATOR. No. 316,898. Patented Apr.'28, 1885 UNITEDSTATES PATENT OFFICE.

MOSES W. KIDDER, OF LINCOLN, ASSIGNOR OF ONE-HA LFTO JOHN S. RICE, OFCAMBRIDGE, MASSACHUSETTS.

CHIMNEY CAP OR VENTILATOR.

SPECIFICATION forming part of Letters Patent No. 316,898, dated April28, 1885.

Application filed January 10, 1885. (No model.)

To all whom it may concern:

' Be it known that I Moses W. KIDDER, of Lincoln, in the county ofMiddlesex and State of Massachusetts, have invented certain Improvementsin Chimney Caps or Ventilators,

of which the following is a specification.

This invention has for its object to provide a chimney cap or ventilatorof strong, simple, cheap, and durable construction; and to this end itconsists in a tube composed of a piece of sheet metal having two or moreseries of longitudinal slots, each formed by cutting a longitudinal slitand two transverse slits at the ends thereof, and bending the metaloutwardly to widen the longitudinal slit and convert it into a slot oraperture for the passage of air, the uncut portions of the tube betweenthe series. of apertures giving strength to the construction, as I willnow proceed to describe.

Of the accompanying drawings, forming a part of this specification,Figure 1 represents a side elevation of a chimney cap or ventilatorembodying my invention. Fig. 2 represents a section on line 00 00,Fig. 1. Fig. 3 represents a side view of a portion of the sheet fromwhich the ventilator is formed.

The same letters of reference indicate the same parts in all thefigures.

In the drawings, or represents my improved ventilator, which is composedof a sheet of metal bent into a tube and provided with a cap, I), at itsupper end, and a suitable base or flange at its lower end to be insertedbetween two courses of bricks in a chimney.

c c 0 represent the orifices in the ventilator through which air, smoke,(to, escape from the ventilator at the one side and enter at the otherside. These orifices are formed in two or more peripheral series, andeach orifice is formed by cutting a longitudinal slit, 2, and twotransverse slits, 3 3, at the ends thereof, as shown in Fig. 3, andbending outwardly the wings made by said slits, as shown in Figs. 1and2.

Between each series of apertures and the next an uncut portion of thetube forms a continuous band around the tube, connecting the slittedportions above and below it, and giving strength andstifl'ness to thetube. The combined area of the orifices 0 should be equal to or somewhatgreater than that of the crosssection of the tube.

By dividing the orifices into series separated by uncut portions of thetube, as above described, I am enabled to obtain sufiicient openings forthe entrance of air and the escape of air, smoke, &c.,without weakeningthe tube.

I do not limit myself to forming the tube from a single piece or sheetof metal, as the intervening bands between the series of orifices may bein separate pieces, riveted or otherwise secured to plates which arebent to form the wings at the sides of the orifices.

1 am aware of Patent No. 9,375, and do notclaim anything shown therein.

,1 claim-- 1. A chimney cap or ventilator composed of a sheet-metaltube, having orifices a, each formed by cutting a longitudinal slit andtwo transverse slits, said orifices being arranged in two or more seriesseparated by uncut portions of the tube, as set forth.

2. A chimney cap or ventilator composed of a tube having two or moreseries of orifices, c c, and an intervening strengthening-band betweensaid series, extending continuously aronnd the tube, as set forth.

In testimony whereof I have signed my name to this specification,in thepresence of two subscribing witnesses, this 5th day of January,

Witnesses: MOSES W. KIDDER.

G. F. Bnown, R. J. PowERs.

